hendry



lIan. 24, 1956 W, R HENDRY 2,731,839

TACHOGRAPH ADAPTERS F'OR GASOLINE ENGINES Filed Aug. 18, 195? 2Sheets-Sheet l 7 221 24 2 ze ,01 25' '5 2a' @4Z is' 9 'a la Ef'zm:

Jan. 24, 1956 w. R. HENDRY 2,731,839

TACHOGRAPH ADAPTERS FOR GASOLINE ENGINES Filed Aug. 18, 1952 2Sheets-Sheet 2 limited States Patent C 'EACHOGRAPH ADAPTERS ENGINESWilliam R. Hendry, Calgary, Alberta, Canada Application August 18, 1952,Serial No. 305,029 1 Claim, (Cl. 74-15.8)

FOR GASOLINE The invention relates to an adapter for introductionbetween the governor and the distributor of a Ford gasoline engine suchas used on four and ve ton trucks and with the general object ofutilizing the adapter to drive a tachograph at its required speed.

A further object is to so design the adapter that when introduced, asabove, it forms a driving connection between the governor anddistributor Without requiring any change in their existing structure andprovides, also, a

A further object is to so design the adapter that it can be easily andquickly clamped in place while utilizing the existing clamp receivingchannels of the governor and distributor.

A more detailed object is to provide an between it and the tachograph.

A further object is to so construct the adapter that all internalworking parts can be readily installed or removed and such that ampleprovision is made for effectively lubricating such working parts.

A further object is to provide the adapter with a grease cup forlubricating purposes and with a screw plug positions require such.

A further object is to so design the adapter such that it can be, with apredetermined worm gear ratio, directly coupled up through a flexibledriving connection with the existing rotor shaft of a tachograph todrive the latter at its correct driven speed or such that with a 1:1worrn gear ratio, it can be coupled up with an exterior gear case ingthe correct gear ratio, to drive, through a flexible drive cable, theexisting rotor shaft of the tachograph at latters correct driven speed.

With the above more important objects and other minor objects in View,which will become apparent as the description proceeds, the inventionconsists essentially in the arrangement and construction of partshereinafter described, reference being had to the accompanying drawings,in which:

Fig. l is a side view of the adapter.

Fig. 2 is a top plan View of the adapter.

Fig. 3 is a side View, rotated to a position, at right angles to thatshown in Fig. l.

Fig. 4 is an inverted plan view as appearing in Fig. 2.

Fig. 5 is a vertical sectional view at 5 5, Fig. 3.

Fig. 6 is a vertical sectional view at 6-6, Fig. 1.

Fig. 7 is a side view of the transmission or coupling shaft of theadapter.

Fig. 8 is a plan view of the lower rotor or disc of the adapter.

Fig. 9 is an end View of the plug which is fitted with the screw plug.

Fig. l0 is a perspective view of the lower end of the transmission shaftof the adapter.

Fig. ll is a side view showing the adapter in mounted position betweenthe governor and the distributor, parts being broken away to exposeconstruction.

Fig. l2 is a perspective view of the upper end of the governor drivingshaft and showing the eccentric pin carried thereby.

Fig. i3 is a perspective view of distributor operating shaft and securedthereto.

Fig. 14 is a side view showing the adapter mounted in operating positionbetween the governor and the distributor and having a gear box connectedthereto and in turn, connected by a eXible driving cable to n e rotorshaft of the tachograph.

Fig. l5 is a side View similar to Fig. i4. .firh the gear box omittedand showing the flexible tacho r cable secured directly to the adaptercoun in the drawings like characters of refe'en e indient correspondingparts in the several figures l will first describe the adapter indetail.

it presents a somewhat spool shaped casing l which is provided with ahorizontally disposed side sleeve Z and its upper circular head 3 issupplied with a eircurnsc hing, exterior channel -fl and with anexterior sunken po t 5. A sleeve 6 (see Fig. 6) extends downwardly fromthe pocket and has the lower end contracted to provide an internalshoulder 6 beneath which is a bearing 7 and above which is an open spacew. h opens to the poclet. The casing also provides a lower r einher lpermanently secured to the sleeve 6 and which is fo ed to provide theside sleeve Z, and a bottom disclilf f being supplied on its undersidewitn concentric to the sleeve 6 and with a s pin A central spindle or ishaft is rotatably mounted in the bearing 7 a s worm .c i lf3permanently secured thereto and engarin the shou o', and the upper endof said shaft, wl..ch tcin'iinatet within the pocket 5, with selectivelyplaced dri Fthe shaft has the lower end vided with a flat face E15 toreceive a complementar; in a. driving disc l', said by an applied 'tv-fl' screws into a centra l lower end of the shaft. selectively placedperiphera undoing the screw l on the shaft with its atta" The ends ofthe sl to receive a screw plug .251 inner ends of both the pl as bestshown Fig. 5. supplied with nutlil o facil a ing or deinounting. Theplug is centrally bored and the outer end of the bore is screw threadedreceive a small closure plug 23 having a squared outer end for wrenchapplying purposes.

the lower end of showing the the slotted disc find 'viii i il Thesleevelilte be.. Yg 2.2 ha cxtcriorly screw threaded for a purA ose saidsleeve rotatably receives a countershaft the inner end of which l havepermanently mounted a worm gear 25, located between the inner ends ofthe plug 2l and the bearing sleeve 22. The gear 25 meshes with gear 13,the

inner wall of the sleeve 6 being cut away to permit such, and obviouslythe contracted or tapered inner ends of the sleeve 22 and plug 21 serveto reduce gear friction at such points. The outer end of thecountershaft terminates flush with the outer end of the sleeve 7.2 andthe said shaft is centrally bored, as best shown at 2.4 in Figs. 3 and 5and is supplied with a lengthwise extending slot 242 opening to thebore.

ln a location opposite the worm gear 25, the sleeve 2 is supplied with aconventional grease cup 26 to receive grease for lubricating purposes,and to insure of effective lubrication of the worms and their shafts.The shoulder 6 has a small, horizontal pocket 27 (see Fig. 6) drilledtherein which forms a by-pass to permit grease to pass from the reservedarea 2S around the worm gear 25 and into a vertical grease slot 29 cutin the bearing 7.

lt may be found in practice that through lack of mounting space, thegrease cup cannot be left located in the position shown in the drawings.It can be readily shifted to a second position by inter-changing thepositions of the grease cup and the plug changed position grease clearsto the interior parts through cross slots 30 (see 1Eigs. 5 and 9) whichl have supplied in the inner end of the screw plug 21.

rThe adapter above described, is especially designed for insertionbetween the existing and well known distributor and governor of a Fordgasoline engine such as are used in four and five ton trucks. Suchdistributors and governors are designated as models Q and QH and theirdetailed parts are clearly shown on page 315 of Ford Motor Company ofCanada, Limited, illustrated parts catalogue.

The inserted adapter is used in conjunction with an instrument known tothe trade as a tachograph and which instrument is usually mounted on thedash panel of the truck and is driven by a flexible driving cable.

When my adapter is used with the existing governor 31 and distributor32, the clamp, such as that 33 used to secure the distributor to thegovernor, is removed temporarily and the distributor is lifted to allowof the insertion of my adapter with its disclike base resting on theopen top end of the governor casing 34 (see Fig. 11) and with itspoclreted circular head 3 supporting the base of the distributor casing.A hole 35 (see Fig. 11) is drilled in the governor casing to receive thepin 10 of the adapter, such being provided for placement purposes. Afterthe adapter has been put in place it is secured in position by applyingthe clamp 33 to fasten the distributor to the adapter and by using asecond clamp 36 to secure the adapter to the governor. Both the existinggovernor and distributor are provided with exterior channels 37 and 33for clamping purposes and the upper clamp 33 is caught in the upperchannel 3S and that 4 of my adapter while the lower clamp is caught inthe channel 37 of the governor and over the edge of the disclike base 10of the adapter.

T he governor embodies as part of its structure, a shaft 39 which isengine driven at one half engine speed and the upper end of such shafthas a disc governor secured thereto and the latter presents an eccentricdriving pin 40 (see Figs. il and 12). When the distributor is mounteddirec ly on the governor, the latter pin serves to drive a disc or plate4l located in the lower end of the distributor, carried by the lower endof the distributor shaft 42 and supplied with a notch 43 (see Fig. 13)to receive the pin 40. When my adapter has been installed between thegovernor and the distributor, the pin 40 is entered in the notch iX ofthe disc 17 of my adapter and the pm of the adapter is entered in thenotch or slot 43 of the disc 41 of the distributor. Accordingly theshafts 39, 12 and 42 are all driven at the same speed which is one halfengine speed.

At the present time tachographs, indicated at 44 in Figs. 14 and 15 aredriven at a speed less than one half engine speed and which tachographdriven speed may vary in different makes of tachographs and it has beenfound necessary to employ a gear box with a selected gear ratio, so thata drive at one half engine speed will drive the particular make oftachograph at its correct speed for recording purposes, the drive beingthrough the correcting gear box. Such a gear box, which is a commercialcommodity, is indicated at 45 in Figs. 11 and 14.

in a governor and distributor assembly, Q and QH hereinbefore mentioned,it has heretobefore been totally impossible to use any of theconventional gear boxes 45 due to the positioning of the distributor andon such account my adapter has been devised. With it installed in themanner hereinbefore described, one can use it with or without a gear box45, as conditions require, provided the ratio of the worm gears of theadapter is designed to suit the particular requirements of theinstallation.

In a case where the ratio of the worm gears 13 and 25 of my adapter is a1:1 ratio and one already has a tachograph the rotor shaft of which hasto be driven at a fixed speed (which may vary with different makes oftachographs), then the existing gear box 45 will be selected andemployed having the correct gear ratio to drive the rotor shaft of thetachograph at its required correct speed. The gear box selected will beconnected by a coupling nut 46 to the sleeve 22 and by a coupling nut 47to a iiexible drive cable 48 in turn connected to the rotor shaft of thetachograph 44.

In cases where my adapters are to be used with existing tachographinstallations where the tachograph rotor shafts are all to be driven atthe same speed, it is simply a matter of making the ratio of the wormgears 13 and 25 such that they will convert the driving speed of thedriving shaft 12 into the correct speed at the countershatt 24 to drivethe rotor shaft of the tachograph at its correct driven speed. Such anarrangement is shown in Fig. 15 where the coupling nut 4'7 is connecteddirectly to the sleeve 22. ln such a latter case and where the shaft 12is driven at one half engine speed, and the tachograph requires to bedriven at one third engine speed, then the ratio of the worm gears 113and 25 will be .666: 1, thus eliminating the necessity for a gear box45.

What l claim as my invention is:

An adapter comprising an upstanding casing having a circular, pocketedupper end and a disclilre base, a vertical transmission shaft rotatablymounted in the casing and having its upper end terminating within thepocket and its lower end extending beyond the disclilre base, a drivingdisc secured to the lower end ofthe shaft, said disc having a recessformed therein for the reception of a pin, a rotor secured to the upperend of the shaft and provided with an upstanding, eccentric pin, saidrotor and pin being within the pocket, a countershaft rotatably carriedby and crossing the casing and intermeshed worm gears of predeterminedgear ratio secured to the transmission shaft and the countershaft.

References Cited in the le of this patent UNITED STATES PATENTS

